Jesus' disciples themselves recognized that Christ's gospel of grace is a difficult message to preach (John 6:60). This message is difficult because it humbles man. However, we must not compromise this gospel message by reducing or modifying its message. Denying this message's offense to man, the role of God, or His sovereign grace is equal to preaching another gospel.
Did God fail to administer justice when He forgave Saul, even though he persecuted the church? This article shows that through Christ's work full payment was made for all sins, and in Him God's justice was fulfilled.